Sewing machine



H. TAUBERT Oct. 20, 1936.

SEWING MACHINE Original Filed July 23, 1932 3 Sheets-Sheet 1 INVENTORflerman Oct. 20, 1936. H, TAUBERT 2,058,271

SEWING MACHINE Original Filed July 23, 1932 3 Sheets-Sheet 2 3B w NVENOR E 1* w fierman Ea er? 7 BYM/ ATTp NEY H. TAUBERT Oct. 20, 1936.

SEWING MACHINE Original Filed July 23, 1932 s Sheets-Sheet :5

INVENTOR firman 7522156722 ATgR EY Patented Oct. 20, 1936 PATENT OFFICESEWING MACHINE Herman Taubert, West Englewood, N. J assignor of one-halfto Joseph Arciere, Union City,

Application July 23, 1932, Serial No. 624,159

Renewed March 13, 1936 Claims.

This invention relates to improvements in sewing machines and moreparticularly to an improved stitching mechanism.

One of the principal objects of my invention is to provide a stitchforming mechanism that will operate much faster than the common shuttletype and will have many of the same advantages.

Another object of my invention is to provide a double needle type ofsewing machine with a cooperating looper whereby an interlocking stitchmay be formed.

Another object of my invention is to produce a double chain orinterlocking stitch with a plurality of needles on a rotary looper typeof machine in which the looper cooperates with each needle to interlockthe multiple threads.

A further and more specific object of my invention is to provide aplurality of needles opto be sewed, the needles carrying separatethreads for a more secure and quicker formed stitch.

Another object of the invention is to provide a sewing machine with aplurality of separate thread carrying needles, multiple thread tensioning fingers and a rotary looper running at relatively double speedwhereby a more rapid stitch may be made than is possible on priormachines and yet will have interlocking qualities and can not be drawnfor more than one loop if damaged in any particular place.

A further object of the invention is to constructa sewing machine of themultiple needle type with a rotary looper than can be adjusted todevelop an ordinary chain stitch if one of the multiple threads isomitted and which will develop an interlocking chain stitch which cannot be accidentally pulled from the material sewed if broken, suchmachine having fewer operating parts and being more readily constructedthan other machines forming interlock stitches.

Further objects and advantages of this invention will appear from thefollowing description thereof taken in connection with the attacheddrawings illustrating a preferred form of em-' shown in Fig. 2 butshowing an advanced step in the needle movement.

Fig. 4 is a horizontal section taken substantially on the line 4-4 ofFig. 3 and showing the tension fingers.

Fig. 5 is an elevation of the cloth moving mechanism below the head endof the machine.

Fig. 6 is a partial elevation diagrammatically showing the relation ofthe needle points to the looper in the first position.

Fig. 6a. is a plan view of the looper in the position shown in Fig. 6.

Figs. 7 to 13 are further elevational views of the needles and loopersin subsequent steps in the cycle.

Figs. 7a to 9a are further plan views of the looper inthesteps shown inFigs. 7 to 9, and,

Fig. 14 is a vertical section schematically showing the shape of .thestitch, with one thread in solid lines and the second thread in dottedlines.

Sewing machines are commonly of the chain stitch or rotary looper typeor of the shuttle or lock stitch type. The chain stitch, although morerapidly made, is unsatisfactory in most cases as the breakage of a loopin any place, will permit the entire thread to be drawn from thematerial sewn. The lock stitch or shuttle machine, avoids thisdifiiculty by using a reciprocating or other form of shuttle which isslower acting and results in materially slowing up the stitch.

Other forms of stitch formingmechanism are also known such as themultiple needle type in which the needles enter either at differentpoints in the cloth or from different sides of the material. Thesemachines are unsatisfactory due not only to the complicated mechanismwhich increases the cost of the machine and requires frequentadjustment, but in most instances such machines are not generallysatisfactory as they will not make fine stitches and be generallyadaptable to sewing and the stitches formed are not satisfactory.

In the present instance, I have shown a pre-.

ferred form of embodiment of my invention and while I believe it to bethe better construction to carry out my purpose, I realize that certainchanges may be made without changing its principle of operation. Itisalso to be understood that the device is primarily constructed to showthe general arrangement of the parts to carry out the purpose of theinvention.

The sewing machine shown in Fig. 1 consists of the usual frame I0 forexample of the cantilever type which carries the working head generallyindicated at I2. The main drive shaft I4 they are well known and may beof any preferred is suitably journaled in the frame near the. top andextends into the head l2. Power may be furnished by any means not shownoperating on the drive belt l5 adjacent the hand wheel I 6.

The frame It is mounted as a rule on a base 18 and the looper driveshaft 20 may be secured thereto. A chain or gear drive 22 is preferablyused to positively drive this looper shaft 29 at a fixed ratio to therotation of the main drive shaft The operating head l2, as shown in Fig.2 carries two needle bars 24 and 216 at slight angles to the verticalbut directed to the same point on the base. The usual presserfootsupport 21 and foot 28 are provided to hold the material to be sewnin the proper position as is well known'in the art.

The needle operating mechanism may beof any desired form which willreciprocate the needles at intervals of One form shown consists in arotary member 30 carrying two cranks3l and 32 each of which is securedto a needle bar by a cross head connection 33 and 34 one near the bottomand the other near the top. The needle bars are each separately guidedand the motion will reciprocate them through the necessary working rangeand will move one downwardly while the other moves up.

The working head l2 also carries tension fingers 35 and 36 carried atthe ends of pivoted arms 3'! and 3B, pivoted at 39 and 4D and carryingintermediate cam followers 42 and 43. A cam 44 is also carried by therotary member 30 on the end of the main shaft l4 and this cam. havingtwo cam tracks operating on the cam followers at the proper interval andin moving the respective pivoted levers, oscillates the tension fingers35 and 35. Fixed thread guides M cooperate with the movable fingers.

It is understood that the other thread guides and tension head for thethread are omitted as construction. It is understood however that atcertain points in the operation of the needles, a tension guide orequivalent means prevents the thread from freely moving to the needleand at that time the tensioning fingers 35 and 36 operate on the threadto pull it taut at the needle thus making the stitch tight. Theparticular arrangement of the tensioning fingers will be more clearlyunderstood from Figs. 3 and 4 in which the relation of the cam and camfollowers is more clearly shown. In Fig. 3 an advanced movement of theneedle is also shown.

The looper 50 is carried at the end of the looper operating shaft 26and, is preferably rotated at twice the speed of the main operatingshaft l4 so that the point end 59a of the looper comes into the propertop position at the same relative time for each needle. The looper isplaced below the base I 8 and adjacent thereto is the material movingjaw 52 which is linked in a well known manner to the base l8 and theeccentrics 53 so that on a complete cycle the jaw moves upwardly andforwardly and the cloth or material to be sewn is thus urged forward forthe next needle. As this operation is well known in the art, no furtherexplanation is thought necessary.

The formation of the stitch is brought about by the cooperation of thelooper and the two needles. To more clearly describe this cooperation, aseries of diagrams, Figs. 6 to 13 may be referred to, each of thediagrams representing a part of the cycle of stitch formation. As thetwo needles each form part of the stitch, a cycle thus includes onerevolution of the main operating shaft and thus two complete revolutionsof the looper. It is to be noted that the looper as has the pointed end50a for engaging the thread and drawing it from the. needle point andalso has a blunt end 50b for spreading the loop after opening it. Theneedle points in the diagrams may be designated L and R for left andright needle to facilitate the explanation, either being any particularneedle in the operative mechanism.

The first operative position may be as shown in Fig. 6 which shows thelooper point adjacent the tip of the left needle. The left needle hasalready reached the bottom of its stroke and is moving upwards; thethread is thus slightly bulged to be engaged by the looper point. Atthis time the right needle is moving downwards.

The second operative position is shown at Fig. 7. The left needle havingmoved upwards and the looper point having moved from the top, a threadloop is being opened. The right needle is still moving down. At thispoint, where the needles are approximately equally spaced above thebase, the cloth is moved forward.

The third operative position is shown at Fig. 8. The blunt end 50b ofthe looper has now come into position to spread the looper for theinsertion of the second needle. In order to throw off the loop, thebeveled edge 580 of the blunt end 5022 of the looper has now come intoplay and pushes the loop away from the machine with the blunt end 50b ofthe looper between the sides of the loop.

The fourth and fifth operative positions are shown in Figs. 9 and 10 inwhich the loop is held by the curved end of the looper only and as soonas the right needle has crossed into the open loop, the loop will pulloff the curved end of the looper.

In the fifth position, shown in Fig. 10 at the end of the first half ofthe cycle, the looper point 50a engages the second thread which iscarried by the right needle and again starts to carry the thread aroundas is more clearly shown in Fig. 11 or the sixth operative position. Atthis time however, the tension finger-on the operating head of themachine works to draw the thread in the left needle tight andsimultaneously the cloth is moved to prepare for the reception of theleft needle again.

In the seventh and eighth operating positions as shown in Figs. 12 and13, the second loop is carried off the blunt end 501) of the looper bythe beveled edge 59c and the loop is again held open and the left needlethen comes into position between the sides of the loop before the loopcomes off the curved edge of the looper point 50a. This begins therepetition of the first stitch action.

The resulting stitch is more clearly shown in Fig. 14 in which, onethread is shown in full lines and the other in dotted lines to moreclearly illustrate the relation. It will be noted that the threads areinterlocked with each other so that no matter which thread is broken orat what point, the entire thread can not be removed by any amount ofpulling. The interlock forms a plurality of separate thread sectionswhich are independent of other thread sections and can not be broken.

The stitch can be formed at high rates of speed Without injury to thecloth or damage to the machine. The looper operates at double normalspeed but it is a rotary device and can rotate Without any stress on themachine. It operates far faster than any possible shuttle type ofmachine, due to the limitations of. the-movement of the shuttle and willoperate as fast as. any chain stitch machine at the same time makingdouble stitches which are interlocked. The machine furthermore avoidsany complicated constructions and may be made from standard machines bysimple conversion of certain operating parts such as the operating headand the looper. The machine will also operate as a single thread, normal chain stitch machine if one thread isomitted and the proper ratio ofone to one of looper and main operating shaft is used. In some instancesthis may be highly desirable for basting and other purposes.

'While I have shown a preferred form of embodiment to which my device isadapted, I am aware that other modifications may be made herein and Itherefore desire a broad interpretation of my device within the scopeand spirit of my description herein and of the claims appendedhereinafter.

I claim:

l. In a sewing machine of the class described the combination of a maindrive shaft, a pair of needles oscillated by said shaft and maintainedat 180 degree intervals, each of said needles carrying a separatethread, a second shaft, means to drive said second shaft at twice thespeed of said first shaft, a looper mounted on said second shaftadjacent the end of the needles, said looper being adapted to draw oneloop from one of said needles and hold said loop open until the loopercarries the loop from the second needle into the first loop.

2. In a sewing machine of the class described, a loop forming mechanismincluding two needles operating from the same side of the cloth to besewn, means to operate said needles through the cloth at 180 degreeintervals, a looper, said looper having a point, a loop opening portion,and a bevel thread removing portion thereon, means to rotate said looperfor each needle, said looper forming a first loop, holding said loopopen, drawing a second loop through the first loop, and releasing thefirst loop.

3. In a sewing machine of the class described, a loop forming mechanismincluding two needles operating from the same side of the cloth to besewn, means to operate said needles through the cloth at 180 degreeintervals, a looper, said looper having a point, a loop opening portion,and a bevel thread removing portion thereon, means to rotate said looperfor each needle, said looper forming a first loop, holding said loopopen, drawing a second loop through the first loop, and releasing thefirst loop and means to tension said first loop, and means to repeatsaid steps.

4. A sewing machine of the class described, comprising a frame, aplurality of needles carried by said frame, a base, said needlesrespectively passing through a common point of said base and from thesame side of the bass, a separate thread carried by each of. saidneedles, and a looper mounted on said base and cooperating with saidneedles, means to reciprocate said needles at spaced intervals and meansto hold the thread from one of said needles until the other needlepasses therethrough.

5. A sewing machine of the class described, comprising a frame, aplurality of needles carried by said frame, a base, said needlesrespectively passing through a common point of said base and from thesame side of the base, a separate thread carried by each of saidneedles, and a looper mounted on said base and coop-- crating, with saidneedles, means to reciprocate said needles at spaced intervals and meansto" hold the thread from one of. said needles. until the other needlepasses: .therethrough saidholding means including a. looper,'a. pointedend'on. said. looper to engagesaid threads, ablunt poi tion on. saidlooper to spread the thread loops, a biasingportionon saidlooper to:-divert the thread from said looper and curved portion on said looper tohold thethread loop until the pointed portion of the looper is inposition to engage a second thread.

6. A sewing machine of the class described, comprising a frame, aplurality of needles carried by said frame, a base, said needlesrespectively passing through a common point of said base and from thesame side of the base, a. separate thread carried by each of saidneedles, and a looper mounted on said base and cooperating with saidneedles, means to reciprocate said needles at spaced intervals and meansto hold the thread from one of said needles until the other needlepasses therethrough said holding means including a looper, a pointed endon said looper to engage said threads, a blunt portion on said looper tospread the thread loops, a biasing portion on said looper to divert thethread from said looper and a curved portion on said looper to hold thethread loop until the 7 pointed portion of the looper is in position toengage a second thread and means to move the materialto be sewn eachtime a needle leaves said material and means to cooperate with saidmovement to tighten the thread loops and draw the stitch tight. p

'7. In a sewing machine of the class described, the combination of aplurality of stitch forming needles, means to operate the needles at acyclic period of 180 degrees including a drive shaft, a looper axiallymounted on said shaft and r0- tating in a single plane, means to rotatesaid looper a full rotation on each needle cycle, said loopercooperating with each of said needles in the same relative position toform a single row of a double interlock stitch. V

8. In a sewing machine of the class described, means to form aninterlocking stitch at high speeds in a material to be sewn whichcomprises a plurality of needles, each of said needles carrying aseparate thread, means to reciprocate said needles through a commonpoint in cyclic sequence, looper means to engage each thread as therespective needle passes through the material, saidlooper forming a loopand holding said loop open and discharging said loop, said looperforming a loop of the other thread at substantially the point of releaseof the first loop, and means to rotate said looper one completerevolution for each thread.

9. In a sewing machine of the class described, means to form aninterlocking stitch at high speeds in a material to be sewn whichinclude a plurality of needles each having a separate thread, means toreciprocate said needle in angular relation through a common point, anda rotary looper in driven relation with the needle reciprocating meansmaking one revolution for I ing thread releasing means to release oneloop after the beginning of the second loop, and tension means totension the released loops.

10. In a sewing machine of the class described point common to a pointthrough which the first needle reciprocates and from the same side of acloth to be sewn, said machine being adapted to form an interlockingstitch when the ratio of rotation of the looper to the reciprocation ofeach needle is two.

HERMAN TAUBERT.

